Jinx The Loose Cannon

Whenever a champion or tower that Jinx has dealt damage to within the last 3 seconds is killed or destroyed, she gains 175% movement speed that decays over 4 seconds.

Switcheroo!

Toggle off—Pow-Pow, the minigun: Jinx's basic attacks grant bonus attack speed for 2.5 seconds, stacking up to 3 times. The stacks decay one at a time when she stops attacking with her minigun.
Switching to her Rocket Launcher will not clear any active stacks, but they will not grant attack speed after her first attack.
Cooldown: 1 sec
Bonus Attack Speed: 16.6 / 23.3 / 30 / 36.6 / 43.3%
Total Bonus Attack Speed: 30/55/80/105/130%
Toggle on—Fishbones, the rocket launcher: Jinx gains bonus attack range and deals 10% AD bonus damage on her attacks, at the cost of mana per attack.
Additionally, her attacks will splash, dealing full damage to all nearby enemies. The bonus damage to her target and the splash damage both scale additively with critical strikes.
Bonus Range: 75 / 100 / 125 / 150 / 175

Active: Jinx tosses out 3 chompers that, once armed, explode on contact with enemy champions dealing magic damage over 1.5 seconds to nearby enemies. The champion that sets off the chomper is also rooted the same duration. Chompers explode automatically after 5 seconds. A single champion can only set off a single chomper, but can be damaged by any number if they remain in range.
Cost: 50 mana.
Cooldown: 24 / 22 / 20 / 18 / 16
Range: 900
Magic Damage: 100 / 150 / 200 / 250 / 300 (+1.0 per ability power)

Endgame items

+45% Attack Speed
+30% Critical Strike Chance
UNIQUE Passive - Spectral Waltz: While within 500 units of an enemy champion you can see, +12% Movement Speed and you can move through units.
UNIQUE Passive - Lament: The last champion hit deals 12% less damage to you (ends after 10 seconds of not hitting).

BotRK on Jinx?! U mad?!

Actually not, especially if enemy team is tanky (some bruiser based comp). BotRK maybe gives you less AD than Bloodthirster, but it have amazing passive which is always usefull. However, less AD means your 'Zap!' and 'Super Mega Death Rocket' are not as powerful as they should be (that's why people think BotRK suck on Jinx). Thats why your second item MUST be Infinity Edge. You already have Attack speed, beautiful passive and lifesteal from Blade, all you need is AD and crit chance. Now when you hit like a truck with AA and abilities, It's time for some attack speed (time for Phantom Dancer). You don't need to rush armor penetration due to BotRK's amazing passive, but sooner or later you're gonna need that, so remember to buy Last Whisper. End your build with Guardian Angel and you're done! :)

Seal

Quintessence

Here are the runes!

Mark with AD? Obvious. Seal of armor? Obvious. Glyphs of magic resist!?! You'll need MR in early game to negate some of the supports poke (all supports deal mostly magic damage). Life steal quitessences? Life steal is always good, espacially when you have attack speed buff like Jinx while using her 'Pow-Pow' (the mini gun).